4. A discrete-time LTI system defined by its input-output relationship is given as y[n] =(x[n] + x[n – 1] + x[n – 2]). a) Find and plot the impulse response h[n] of the system, that is, the output when the input is the unit impulse function x[n] = 8[n]. b) Find and plot the step response s[n] of the system, that is, the output when the input is the unit step function x[n] = u[n]. %3D

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Photoelectric

The photoelectric effect occurs when light (or similar incident radiation, including X-rays) falls on material together with a metal plate and causes it to emit electrons. The discovery of the photoelectric effect led to important new theories (and to a Nobel Prize for Albert Einstein). Photoelectric cells, or photocells, are utilized in burglar-alarm light detectors and garage-door openers (each employs a through-beam of light this is broken when something movements throughout it), and also to play soundtracks on film movies (in which a light beam shines through the soundtrack encoded at the film and is "read" with the aid of the photocells).